With other SharePoint sites I've used in the modern experience, you can click 'Edit' at the bottom of your site's left-side navigation bar to edit the links.
I have one site, however, which is preventing me from doing so, despite being an owner of the site and with an Admin account for the tenant. Instead, when I click 'Edit', I am taken to a separate settings page for 'Navigation Settings'. Usually I can just edit the links without the site switching to this page.
The page I see is below. Whenever I attempt to edit the links here and click OK, I am presented with an 'Access Denied' error message saying I do not have permissions to access the resource. The same thing happens to other people with owner permissions.
Does anyone know why this is happening? Any other site I edit the links on never takes me to this page and never shows any kind of permissions denied error?