IPad app to annotate PDF without showing a toolbar

I want to find an iPad app that allows me to annotate a PDF with an Apple Pemcil while all the app’s toolbars and navigation menus etc. are hidden.

Ideally, I would like to select an annotation tool (say a highlighter or pencil), hide the toolbars, and then just go through the document (a lecture that I am recording) occasionally highlighting or writing a few words here and there. I don’t want the mostly-unused toolbars to clutter up each and every slide.

Apps like Notability and PDF Expert hide their toolbars while in “presentation mode”, but ONLY when the content is being mirrored by HDMI or AirPlay, and not when connected to the Mac (doing the recording) by cable.

Basically, I want an PDF annotation app with a “presentation mode” equivalent that the user can choose to enter when they want, regardless of how the iPad is connected externally.

Just found an app that somewhat does this after looking for quite a while: PDF Reader & Annotator by Xodo. It allows using the Apple Pencil as “ink” when the toolbar is hidden.