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Delete, Ungroup and Dissolve Groups
Deletes regular layers, Precomp Clones, and groups (Win: Shift+FwdDel, Mac: Shift+Delete).
Select either a regular layer, a Precomp Clone layer, or a group header and then execute Delete Layer / Clone / Group.
If you delete a regular layer that is contained in a Precomp Clone, it will remove the layer from the Precomp Clone as well.
If you delete a track matte layer, it will remove the track matte state from the layer below.
Otherwise, it is identical to AE's Delete when deleting regular layers.
If you delete a Precomp Clone, the function will also delete the clone comp item from the project window. If you would delete the Precomp Clone using AE's Delete, only the layer within the comp, not the clone comp itself would be deleted. Because of that, expression errors will appear since the expressions on the clone layers cannot reference the Precomp Clone anymore. That's why it is always advised to use Delete Layer / Clone / Group when deleting a Precomp Clone.
In case, unused clone comps already exist and expression errors accumulate, open up the settings, go to the Cloning tab and click Delete Unused Precomp Clones.
Just deleting all group layers individually still would leave the additional, shy'd layers from the group, so always use Delete Layer / Clone / Group to delete a group, or alternatively use Select Group and then use AE's Delete.
Releases layers from a group, or a group from another group (Win+Mac: Shift+H).
Left: Layers in Sub-Group at the End of a higher Group; Center: Layers moved down and now appear two Levels upwards; Right: Layers moved using 'Ungroup Layers' and now appear one Level upwards
All selected layers or groups will be ungrouped and moved below the group they were contained in. This is especially useful when the containing group is right at the bottom of another group. If you would move the layers below by yourself and then execute Refresh Layout, the layers would then be shifted two levels upwards instead of one. In these circumstances, use Ungroup instead to only move them one level upwards.
Dissolves a group (Win: Ctrl+Shift+FwdDel, Mac: no default shortcut).
Select either the group header or a layer contained in the group and then execute Dissolve Group. It will remove the group but will not delete all contained layers, as Delete Layer / Clone / Group would. It will release the layers one level upwards, either to a higher group or move them out of groups completely.