This problem is unsolved and could compromise my work.
Strange behaviours of Trados Studio 2024 occurs since recent windows updates
(image blinking repeatedly, program display on 2 screens, program is "zooming in and out" or flashing).
Here's what I tried and thank you for your help.

Installed last Intel driver (32.0.101.7085)
Intel update OK
Windows Update OK
Firefox : unticked material acceleration
Refresh Firefox
unticked unnecessary Add-Ons
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My computer : Intel Core i7 12700
Alder Lake
12th generation Intel Core i7-12700
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Intel Graphics Software & Drivers Installer
New ASUS screen, verify the resolution is the same on both screen
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Trados Studio 2024 SR1 - 18.1.4.6694
Reset Window Layout
High DPI settings (modify the behaviour)
Rename Local parameters files to provoke the creations of new ones (AppData\Roaming\Trados Studio)

After many attempts (even buying another monitor, TRIED going back to previous update)  the problem is still there.