If you're using a trial, you cannot disable the Welcome Screen. We hope the tutorials will be helpful in getting started with Photoshop CC or learning about the new features available in Photoshop CC.

If you're a paid Creative Cloud member, after the Welcome Screen loads, scroll down to the bottom of the New Features, Getting Started, or Tips & Techniques sections. Select Don't Show Welcome Screen Again. To display the Welcome Screen again, choose Help > Welcome.

Note: In recent versions of Mac OS, scroll bars don't display by default. To turn them on, open System Preferences > General. Select Always or When Scrolling in the Show scroll bars section. 

If you are not able to get to the Don't Show Welcome Screen Again option, run the below script to turn off the Welcome Screen. You can view it by choosing Help > Welcome.

1. Exit Illustrator, InDesign, and Photoshop.
2. Download the prevent_project_hello_launching.jsx.zip file below. Remember the downloaded location.
3. Double-click the downloaded file to decompress it. On Windows, choose to extract all files. The decompressed script is named prevent_project_hello_launching.jsx. Remember the location of the decompressed file.
4. Copy the decompressed file to the following locations:
   1. Illustrator
      1. Windows: C:\Program Files\Adobe\Adobe Illustrator CC 2014\Support Files
      2. Macintosh: HD/Library/Application Support/Adobe/Startup Scripts CC/Illustrator
   2. InDesign
      1. Windows: C:\Program Files\Adobe\Adobe InDesign CC 2014\Scripts\startup scripts
      2. Macintosh: HD/Library/Application Support/Adobe/Startup Scripts CC/Adobe InDesign
   3. Photoshop CC 2014
      1. Windows: C:\Program Files (x86)\Common Files\Adobe\Startup Scripts CC\Adobe Photoshop
      2. Macintosh: HD/Library/Application Support/Adobe/Startup Scripts CC/Adobe Photoshop
5. The Welcome Screen doesn't display until you remove the file or you view it via the Help menu.

The Welcome Screen is not visible for a subset of paid Creative Cloud and trial customers. All the learning content in the Welcome Screen is available with Creative Cloud Learn on Adobe.com: https://helpx.adobe.com/photoshop/tutorials.html

The Welcome Screen doesn't display for people who are not signed into their Creative Cloud account with their Adobe ID. Instead, you see a dialog box that says "To use the Welcome dialog, please sign in to Creative Cloud."

The Welcome Screen also does not display if you have something other than English set for the user interface language in Photoshop.

Determine if the computer or Photoshop is frozen.

• Move the Welcome Screen by dragging the title bar.
• Close the Welcome Screen by clicking the close button.
• Switch to another application.

If you cannot do any of the above, see "Welcome Screen is frozen".

If you can do any of the above, the computer has not frozen. If the "Welcome Screen is blank or content takes a long time to display", see Welcome Screen is blank.

The Welcome Screen could appear to be frozen, but is actually taking a long time to display. See the sections below to determine if it is frozen or not.

If the Welcome Screen is frozen, try these solutions:

Solution 1: Clear your recent files.

If the Welcome Screen is frozen, try closing the Welcome Screen. If you can close it and keep working in Photoshop, it could be that a file you recently opened contains characters that can cause this issue to occur. Choose File > Open Recent > Clear Recent File List to remove this data from Photoshop's history.

Solution 2: Update or disable your virus protection software.

An old or damaged version of virus protection software can prevent the Welcome Screen from displaying. Temporarily disable your virus protection software, and see if the Welcome Screen opens normally. If it does, reinstall or update your virus protection software.

The Welcome Screen is HTML-based. Anything that can affect a web page loading can also affect the Welcome Screen,  including virus scanners, firewalls, and network connection issues.

Solution 1: Close the Welcome Screen and work in Photoshop.

The Welcome Screen might not be frozen, so try to close the Welcome Screen and continue to work in Photoshop.

Solution 2: Reset your preferences.

To re-create the preferences files for Photoshop, start the application while holding down Ctrl+Alt+Shift (Windows) or Command+Option+Shift (Mac OS). Then, click Yes to the message, "Delete the Adobe Photoshop Settings file?" 

Solution 3: Update or disable your virus protection software.

An old or damaged version of virus protection software can prevent the Welcome Screen from displaying. Temporarily disable your virus protection software, and see if the Welcome Screen opens normally. If it does, reinstall or update your virus protection software.

Solution 4: If you encounter a blank Welcome screen along with the message 'JavaScript Prompt - File:/// , SERVER CREDENTIALS REQUIRED', launch a separate browser and log in to your local network with your user name and password.

The following URLs are used to download the content of the Welcome Screen. If they are blocked, your Welcome Screen remains blank.

• helpx.adobe.com
• wwwimages2.adobe.com
• adobe.demdex.net
• stats.adobe.com

While a network connection is available, the Welcome Screen attempts to use it to update content. If there is any form of network security which blocks any part of this communication, the Welcome Screen will not load. If you are not connected to the Internet at all, the Welcome Screen loads using preinstalled offline content. If the Welcome Screen loads while disconnected from a network, it means a form of security not mentioned above may still be blocking the Welcome Screen. See Troubleshoot Connectivity Issues for further steps.

This article is based upon the following Adobe Knowledge Article: https://helpx.adobe.com/photoshop/kb/troubleshoot-welcome-screen-photoshop.html