Unfortunately, I have to tell you that I can’t offer a solution that eliminates the need to manually adjust this configuration. Unfortunately, in the case of kwinoutputconfig.json—where this configuration is stored—it’s not that easy to automate these adjustments. If the file is modified, the changes are ignored. This configuration file is also only loaded during the initial startup. The actual configuration is not read from there during the session, but rather from memory. Therefore, for changes to take effect, a new login would be required. However, this is not a solution I can implement for the live system. I was also unable to find an API method to adjust the configuration. Unfortunately, the effort involved here is greater than simply providing the workaround with screenshots in an FAQ post. I will therefore provide an FAQ post with screenshots in the near future. Perhaps we’ll be lucky and this issue will be fixed in a future KDE Plasma version, so we won’t need this workaround anymore.