Subsequent editing of the start options

This dialog appears when a program is dragged into the toolbar.

How can I call it up again later if I want to make a change?
You can only change it via this dialog (cumbersome)

There also seems to be a display error here
when clicking on the different selections
Frame appears sometimes thin, sometimes thick
grafik

grafik

The only way to bring it up again is to delete the old button and make a new one via drag & drop.

You can't use it to edit existing buttons; it's just a helper for creating new buttons and isn't able to handle everything the full button editor can do.