Civilization VI Fix below
First step on your Civilization VI page, you can click the cog icon and select the properties.
Clicking the properties will display the Civilization VI general properties and apply this string with its quotes "C:\Program Files (x86)\Steam\steamapps\common\Sid Meier's Civilization VI\Base\Binaries\Win64Steam\CivilizationVI.exe" %command%
Applying the launch option usually fix the issue. You're Civilization 6 location varies from user to user you can verify your directory you can do this.