How do I remove the bookmark sidebar on the left side of my iPad. I’ve tried turning off multitasking and several other things it said to do, nothing removes it.

The Apple Support Community pages are not a chat service - where you might expect an immediate response.

Instead, you compose a technical question - including as much technical detail about your specific problem as you can - then you post your question. Now you patiently wait for a reply.

If you are lucky, another contributor will see your request for help - and if they have any suggestions or guidance, may respond.

This help page might help you to compose your question:

Writing an effective Apple Support Commun… - Apple Community

In the upper left hand corner of your iPad you will see a “blue” icon that looks like a book. Tap that and the sidebar should go away.

Just tap on the blue bookmark icon in the upper left part of the screen to close the bookmarks pane.