Sumatra doesn't remember last opened files


I’ve checked the option, but it doesn’t work. Why is that?


There could be several reasons, possibly the settings file has somehow been locked against changes, or the setting is not sticking the way you expect.
Go to advanced settings and first check the entry for RememberOpenedFiles = true

test you can save the settings file

Note the term is plural it will not “remember” the last single file there must be two or more TABS open when you close SumatraPDF using Ctrl-Q (File exit) so open 2 files in tabs and press Ctrl+Q or use file > exit or Alt+F4 now when you open Sumatra are those two files re-opened ?

Usually the last single file open is available via Alt-F and 1