The solution that worked for me was the following.
1. Uninstall Drone2map
This does not remove all the settings though.
2. Remove/Backup the settings folder
C:\Users\<your_user>\AppData\Local\IsolatedStorage\qevc5fgp.m0l
qevc5fgp.m0l : this is a randomly generated folder name
NB! Please note editing the registry can compromise the stability of your operating system, please make a backup of the registery before hand.
3. Remove this registery entry Computer\HKEY_CURRENT_USER\Software\ESRI\Drone2Map
4. Reinstall Drone2map.
These steps will bring back the initial configuration screen.
Also make sure to upgrade ArcGIS Pro before following these steps.