I have many connections, which I group with subfolders.

When I startup, I get my complete list of connections

They are grouped by folders (see attached image)

Some of the folders are in Collapsed mode
and some are in Expanded mode.

Example of what I am seeing:

Development >
.....Developer
.....Tester
Testing >
.....Tester 1
.....Tester 2
.....Tester 3
.....Tester 5
QA >
Customers >
.....Acme
.....Bell
........
.....ZZZ Inc.

Example of what I wish to see:

Development >
.....Developer
.....Tester
Testing >
QA >
Customers >

I would like to have most of my connection folders in Collapsed mode,
so I can see the complete list at once and go to the folder I am interested in quickly

I could not see in the manual how to control this.

I am on version 15

The Connection List comes back in the exact same collapsed/expanded state when PL/SQL Developer was closed the last time. There is currently no option to control this behavior.