Mask controls are partially hidden on screen

Unfortunately, I can't reproduce this on my Macbook Pro 15".  Adobe is much more likely to pay attention if a bug report has simple steps for reproducing it.  Next steps to reproduce it on other computers:

1. Do the menu command Help > System Info (Ajuda > Informações do sistema) and copy paste its entire contents to here.

2. What is the setting of Preferences > Interface > Font Size (Preferências > Interface > Tamanho da fonte)?

3. In the submenu Window > Screen Mode (Janela > Modo de tela), which menu item is checked?

Some previous reports of the sliders not getting sized correctly in non-English languages:

https://community.adobe.com/t5/lightroom-classic-bugs/p-develop-sliders-using-spanish-as-language-seem-to-have-shrunk-compared-to-the-english-version/idi-p/12249999 

https://feedback-readonly.photoshop.com/conversations/lightroom-classic/lr-classic-brush-panel-ui-problem-italianspanish/5f5f45de4b561a3d426409df 

https://feedback-readonly.photoshop.com/conversations/lightroom-classic/lightroom-cc-adjustment-gradient-tool-panel-is-too-wide-in-french-cant-read-the-numbers-on-the-right/5f5f457a4b561a3d424f03f5 

A possibility, corrupt preference file.

see:

https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html

The preference file can get corrupted leading to buggy behavior. A corrupt preference file will survive uninstalls, updates, and upgrades. By renaming or moving or deleting the preference file you create a situation where LrC will recreate a fresh new one upon startup of LrC. Be aware various settings will revert to defaults.