That’s what the hide button should look like. I’ll add this to the next update.
When activating this here for SDTV, the SDTV group is gone when returning to the Live TV section. When you open the context menu…
…and select the Group option, the SDTV channel group is gone:
With the Hide group option not selected in the Group manager, the SDTV group is visible again when selecting the group option in the Live TV context menu.
See the PR: PVR group manager hide option hotfix #37