This is standard install of wordpress with the default theme, I've tried changing the theme and the settings in the Civicrm Admin Utilities plugin but to no avail. The menu appaers fully displayed below the dash board but is fully obscured by the wp menu, and only visible when that is collapsed. I'm aware this is a formatting issue, but I wondered if anybody had seen it before in a fresh wordpress install
For WordPress 5.5.1 the minimum CiviCRM version is 5.26.2. I'd recommend 5.28.4 as that is the security release.
Due to changes in WP you may also have to update your settings.
Even though the changes discussed come into effect in 5.29 this doc: https://docs.civicrm.org/sysadmin/en/latest/upgrade/version-specific/#civicrm-529 is a good explanation of paths for CiviCRM and WP