I cannot get rid of this problem.

The solutions mentioned on the internet are missing the places to be clicked. I cannot find the mark as option on the right-click context menu.

CodePudding user response：

Most probably your .idea files are broken, the .iml file and/or modules.xml are either missing or corrupted, so all the project files are treated as non-project. Deleting and re-creating .idea folder should help:

• close the project
• remove it from Recent projects list
• shut down the IDE
• delete the .idea folder
• restart, open the project root folder with File > Open