@pscenea Hi. this is a known issue. Developers have already patched this and you can test the latest development version to see the fix.
Win64 October 7th - https://drive.google.com/file/d/1aClxCCCyRqtKxkvQCkGiVRQN349Nh0TM/view?usp=sharing
We also have some workarounds for this as mentioned here: Timeline keeps disappearing whenever I press ALT and here: Timeline keeps disappearing whenever I press ALT