On MacBook Air M1 Big Sur, AP ver 1.8.6 did not initially show Layer Panel Visibilty tickboxes.
After some tutorial work had been done the tickboxes eventually appeared, triggered by manually widening the panel area. The tickboxes remained visible even after the panel area was narrowed again.
Note I have remained an Affinity Photo novice user for many years, could only ever used AP for the simplest of jobs, like JPG to transparent PNG conversion. This is probably because of certain non-intuitive UI/operating features which I have not yet seen explained in a tutorial. I recently decided to study the tutorials in the hope that these secrets would be accidentally revealed.
Not coming from a Photoshop background, more Paintshop Pro and similar, it is not obvious how to do simple things like selecting an area and deleting it to reveal the background. The tutorials all assume that you already know certain things, mainly that you can't do anything in AP without layers, because the initially imported bitmap is protected. There is no 'locked' icon on each layer, just a padlock above which changes subtly as each layer is selected.