There is also a preference / registry setting if you want to dig into that and avoid resetting other things that new & reset does. (I thought there was a UI preference checkbox somewhere but cannot find it - only the one in the dialog itself to now show it again.)
For Mac, com.graphisoft.AC 13[version.plist has
WorkEnvironment > StartupDialogEnabled
just check the item to re-enable the dialog. Did not fire up Windows to look, but I assume it is something like current user > Software > Graphisoft > [AC 13 version thing] > WorkEnvironment > etc
Cheers,
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sequoia 15.2, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB