This seems to be set automatically by the system. I tried. I can modify it. Select the English directory, click the right mouse button to display the menu bar, and select the font option in the menu. In the pop-up dialog box, you can see that there are two options in the effect column below, lowercase letters and all uppercase letters. Do not check these two options.

I also encountered this problem when editing the catalogue and found a solution, hoping to provide a solution for the landlord and those who need help later.