Thank you.
It did not bring up the window you mentioned. And the text is so small I
don't know if the reset action took place.
I closed and reopened Illustrated, still too small. But thank you for the
suggestionHello @susan_9558,
Could you please try the following steps and check if they help:
- Revert all Illustrator UI scaling settings to the defaults (small).
- Change the resolution and scaling settings under Windows Display settings to the defaults.
- Relaunch Illustrator
If the problem persists, try the following steps:
- Launch Illustrator, set the UI Scaling to large, and then quit Illustrator.
- Create a desktop shortcut for Illustrator
- Right-click on the shortcut and go to Properties
- In the Properties panel, switch to the Compatibility tab and click on the option for Change high DPI settings
- In the High DPI Settings for Illustrator.exe check the box for Override High DPI Scaling behavior and switch between Scaling performed by between Application and System (Enhanced).

(Note: You will need to log out and log back into your User account after applying the setting for the changes to take effect, and then relaunch Illustrator each time.)
Anubhav