Minus sign to delete a layer does not appear

Hello, I am new in this forum.
I want to manage the layers in my model and to delete all of them, without deleting the objects. I never did it before.
In the layer pannel, the plus sign + appears but not the minus sign -
Is this normal?
Where else can I delete a layer?
Thank you in advance.

There are no layers in SketchUp. There are tags, though. There is not supposed to be a minus sign in the Tags panel. Right click on the tag you want to delete and choose Delete Tag from the context menu. You can select multiple tags in the list before delting if you want to delete more than one.

To help achieve your goals, some time spent at the SketchUp Campus and at the SketchUp - YouTube channel will be very worthwhile. Both sites are from the SketchUp team. On the YouTube channel, pay attention to the Square One Series. It covers the basics for each tool.

Thank you for your quick reply.

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