★Why some blocks cannot be deleted in ZWCAD?

Issue:

Some blocks in the drawing cannot be deleted, why?

Causes:

1. The layer where the block is located is locked, and the objects on the locked layer cannot be deleted.
2. Blocks may be the custom entity generated by third-party plugins, so they cannot be edited or removed. type Ctrl+1 to call out the Properties panel, and select the block to see if the block is a proxy entity.
3. When the block reference is generated by DWF/DWFx drawings, it is related to the setting of the system variable DWFDELMODE, as shown in the figure below, please modify it as 1 to check whether it can be deleted or not.