1. WRT the WP in a subdirectory of another WP site, that can lead to some issues with cascading .htaccess stuff. My preference is to set up sites in parallel (/var/www/site1, /var/www/sit2) rather than stacked (/var/www/site1/, /var/www/site1/site2).
2. Focusing on the menu issue, the dashboard menu is separate from the front-end menus. Looking at https://www.suttonandsutton.com/test/, what do you want to do with that menu at the top? Currently, it’s behind your social icons and not very visible. (The font is also a bit small.)
3. It appears you’re using a premium theme, https://mariusn.com/themes/reales-wp/, Have you contacted the developer for assistance? (I can’t seem to find a support link there.)
4. With respect to deleted posts, it appears you were doing some “bumping” and those were deleted. Bumps draw the attention of moderators, but they might not be in a position to help with a particular issue. The forums are staffed by volunteers who may get distracted after an initial response or they may have missed checking the “notify me of follow-up posts” (which IMHO should be checked by default). Anyhow, awaiting your response. (I did check the box.)