Block wont delete

the rude red block wont let me delete it nor add anything else to my design. I can`t shrink or make the block bigger or doing anything at all. I once got the block deleted, but after i added a cylinder to the grid it came right back realist deleting the cylinder. This might be a grouping glitch but non of the videos helped. https://www.tinkercad.com/things/b9VFoRnmwoz-chair/edit


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