Toggle Split

There is a problem in the toggle split mode. When two files are displayed in the editor part (side by side) at the same time. Previously when I opened different files side by side I could change the files in both sections separately. bu now when I split the window in two I can only change the contents of the window on the left side and the content on the right side remains the original content. Is it a setting error or a program error?

You might want to check the menu options: Navigate > Binder Selection Affects > …

Thank you so much. I dont know how it is changed. Bu it is solved now. Thank you again.

This setting is changing anormaly. settings change automatically for no reason.