That information is stored in the INI file. In the Apps panel of the LaunchPad, double click on the DmDesigner2_5.ini link. This will open up the virtual store version of the INI file (the one actually used by windows).
Look for the [Tip] section:
[Tip]
FilePos=2352
TimeStampLong=1553289500
StartUp=0
StartUp should be 0 to make it NOT start up at launch. If it's 1, edit it in notepad, but then double click again on the DmDesigner2_5.ini link in LaunchPad to make sure Notepad could save it. If it's still 1, you have some kind of write protection on that file or folder or some security setting somewhere.