Hello @Thoon_Aung and welcome to the forum 
Which version of Windows are you using?
It looks like you’re using a 5.2.0-beta release there. Did you have that problem with version 5.1.5?
If not, you need to report this in the 5.2.0 testing topic.
The 5.2 Release candidate is now available:
Krita 5.2 Release Candidate is out! Please help us in another round of testing!
If you’re not using the 5.2. release candidate, please try that to see if the problem still exists there.
Please make any problem report in the 5.2 release candidate topic.
Hello @Michelist
Hello @Thoon_Aung, and welcome to the forum!
Additionally, to the things @AhabGreybeard said:
I can’t reproduce this problem for me using the release candidate, when I put my taskbar at the top of the screen Krita’s menus and toolbars are fully displayed. Can you please try resizing Krita and then returning to maximum window size in the hope it fixes this problem for you (although I suspect you’ve already done this)?
Hello @AhabGreybeard! 
Michelist
Seems like a glitch. Try just pressing expand button two tomes (next to close button).
Hi, thanks for suggestions. I know the answer. It is because of OpenGL. I choose that and become like this. I uncheck now it fix.
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