In the display it is difficult to distinguish whether the sorting mode for the list of package functions is switched on or off.
The image shows the unsorted list on the left and sorting on the right. The difference is hardly noticeable.
I see a yellow underlining. Can you go to Help > Support Info and send me the text of the Info tab page. Can you also let me know your "Reduce icon sizes" setting (Preferences > User Interface)?
Attached is the content of the info page. The behavior hasn't changed with beta 4. However, I'm a bit confused about the reference to the yellow underline. It will surely come because of the chosen theme (Midnight Express Yellow).
The difference in the appearance of the sorting icon (sorted/unsorted) is actually interesting for me. I have to take a closer look... See picture where the red arrow is pointing.
PL/SQL Developer
Version 15.0.0.2043 Beta (64 bit)
Theme: Midnight Express / Office2019Black
Windows 10 Build 19043
de-DE(1031)/Deutsch (Deutschland)