Illustrator cannot save as on Windows 11, need help

Hi @9016723_Tipakorn5897,

Thanks again for sharing the screenshot!

To start, please try resetting the Illustrator preferences and then test if the issue still occurs. Here's how to do that:

(https://adobe.ly/4miaKbi)

Note: make sure to backup the preferences before resetting it. 

If the issue still persists after resetting preferences, please try the steps below:

1. Close all Adobe applications.

2. Navigate to the following location and rename the 'UXP' folder to 'UXP.old':

Windows: C:\Program Files\Common Files\Adobe\UXP

3. Relaunch Illustrator and check if the Save As window works correctly.

Let us know if this resolves the issue or if you notice anything different.

Abhishek