What KiCad version are you using? There are some tab pages missing on the right side.
Yours looks like:
Mine has tab pages for Layers, Objects and Nets next to each other.
Dragging the width of that section may fix it, but the little arrow / triangle makes the rest accessible to, so it’s not such a big deal.
What is the result if you run DRC? This does not only show which errors KiCad thinks there are, but also their locations.
Some other wild guess, maybe there is some stuff “left over” somehow far outside the PCB. I’ve seen some occasions where a duplicate set of footprints gets imported in the PCB editor.
If that does not help, you can gain some “experience points” and upgrade yourself so you can upload the project. Having the project makes it much easier to diagnose.