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otherwise, the launcher is broken and you need to fix it. sometimes uninstall/reinstall works, but theres always a more nuclear option that will 100% fix your launcher... but first try the above.
The ultra nuclear option (NOTE: THIS WILL UNINSTALL ALL OF YOUR HOI4 MODS AND YOU WILL HAVE TO RESUBSCRIBE TO THEM AGAIN).
In your steam app, click on Steam at the top left of the window and select "Backup and Restore Games". Create a backup for HoI4, then uninstall HoI4. Find the game folder in C:\Program Files (x86)\Steam\SteamApps\common\ and delete the Hearts of Iron IV folder if it's there. Then go to Documents\Paradox Interactive and delete the Hearts of Iron IV folder if it's there. Reinstall the game by again going to "Backup and Restore Games", but select Restore Backup this time. This should ensure that when you reinstall the game, it will be as a blank slate.
go to Steam\steamapps\common\Hearts of Iron IV\launcher-settings.json and change "gameDataPath": "%USER_DOCUMENTS%/Paradox Interactive/Hearts of Iron IV", to "gameDataPath": "c:/users/%USERNAME%/documents/Paradox Interactive/Hearts of Iron IV"
this bug has existed for close to a year now and affects a large number of players. paradox doesnt care enough or lacks the talent to fix it