Two instances of Dopus. One shows AppData, the other doesn't. I launch the Dopus instance that shows AppData by using Voidtools Search Everything to show all AppData folders and clicking on the table entry whose path entry is C:\Users\User. (Dopus is set as my default file manager.) I launch a second Dopus instance by left-clicking on the Windows 10 desktop and selecting C: drive, then the Users folder, then the User folder. This instance does not show AppData,
See if you have hidden folders turned off in Preferences / Folder Tree / Contents. AppData is marked as hidden (indicated by the faded icon) so if hidden folders are turned off it will only be shown in the tree if it's needed (e.g. if you actually navigate to it).
I see the AppData folder now. Unchecking "Hide hidden files" in Preferences / Folders / Global Filters seems to have done the trick. Thank you for your help.
The red 'X' badge on Folders / Show Everything seems to be permanent. The green check mark badges on Folders / Show Hidden / Files and Folders / Show System Files also seem permanent, regardless whether their corresponding entries in Preferences / Folders / Global Filters are checked. What do these three badges badges indicate?