Hi,
Unfortunately it’s not possible you use Custom UI for marco config in Forge (FRGE-513). Apps like Draw.io can do it because it’s possible on Connect.
The glass pane isn’t something you can hide in either Connect or Forge - although that is something we’ll look to solve as part of the Live edit pages project.
The only workaround on Forge would to have a config/settings button on the published view of your macro that opens a modal. You would need to store the values in Forge storage rather than the config of the marco though.