Hi
The images are very helpful but I was expecting to see something like in this page: https://www.ads-software.com/documentation/article/dashboard-screen/
On the site frontend (as an ordinary visitor to the site) all seems okay and I can see your WordPress version is up to date (6.6.1) and PHP is 8.1.28
Q. did you get the dashboard as per the above link before? and if you did, when did it end up as in the image? Is there a Pages list in the structure? If there is, that’s where I would expect to open pages to edit if that’s what you are attempting.
To see what may be happening, just before you select a link that goes to a 404, can you see the URL? usually at the bottom left view in desktop when the cursor hovers on the link, if you do see the URL, are you able to note it?
Finally, can you think of any recent update or change before you started getting this issue?