Can't right click at all or let click drop down menus

Hi Ive been working on a project for university and it was all going fine up till this week. I can now no longer right click most things or open most drop down menus.

I have looked and seen that this problem has happened to people, the spacebar trick works on some drop down menus but not all of them which means it is still a big problem for me right now. I have recently had a Windows 10 update but I am not a Windows insider so I don’t think I can change to different version?

I have a YouTube video here to show what I mean, with the buttons I am pressing -

You don’t need to watch the whole video, the first 10 seconds should show I mean.

Any help will be greatly appreciated, I have sent this to my lecturer so he may come up with a solution or hopefully an extension if I cant fix this anytime soon.

Nevermind I have managed to fix this now.

I did a Windows 10 recovery to go back to a previous version.

你好,把windows 主题设置成高对比度能解决这个问题,只是会变得不好看