New Finder and "save as" issues for macOS 26.0 and forth

After updating to macOS 26(26.0, 26.1 and 26.2), I found some daily buggy like issues, hope any macOS talents give me advices to solve them, thank you:

(1) Finder horizontal scroll bar screens the column width adjustment button. In column view mode in the Finder, when opening any multi-level folders, once the horizontal scroll bar is activated(after opening a few subfolders), the horizontal scroll bar will cover the entire thin level of horizontal bottom area of the list screen and also screen all the adjustment buttons "||" of at the bottom of all the column partition bars(also the column scroll bars), no matter the "||" is behind the horizontal scroller or just beside the scroller, you just can't click it and use it to adjust the column widths. This always happens no matter what the window size is, full-screen mode or not, and you can't fix it by restarting the macOS.

(2) Tab button jumping sequences in saving. Before updating to macOS 26, when saving a file, click a exist file in the file list showed would generate the same file name inside the "Save As" box, then I pressed <Tab> and the cursor would directly jump into the "Save As" box and let me instantly modify the file name base on the original one, so convenient for daily. But now, I need to press "Tab" 6 times to do so, it is very very annoying.