Reply To: Can I remove a texture from the “Texture Slots” panel in “Texture Paint Mode”?
In modern Blender you can easily see what Texture Slots are; look in the Shader Editor:
The Slots refer to Image Texture Nodes and in above screenshot they are all empty; there are no images made yet, the Image Editor is blank. When deleting the Image Texture Nodes, the corresponding Slot might stay, but when closing and opening Blender they will be gone (I think this is called ‘orphan data’).