The default homedir is in Documents folder, this can be overridden with -homedir launch parameter. If you are using that, the homedir will be located somewhere else, refer to launch parameter's value to locate it. From that position, head to ETS2's name, then open "mod" folder. ProMods Europe and Middle East addon files go in that folder. According to your screenshot, these files are located in OneDrive folder. TruckersMP can't find the files in this directory. As ProMods Europe mod and Middle East addon are large, you will get bottleneck caused by your Internet connection. There are plenty of tutorials to turn off OneDrive.