Hello,
Sorry to hear you are having issues customizing your menu – what theme are you using? Could you please provide the link to your website?
It is best practice to delete any plugins that are not being used on your website. You can tell which plugins are active and inactive from Plugins > Installed Plugins. Active plugins have a blue background and inactive plugins have a white background.
Keep in mind that all plugins, themes, and WordPress itself should be kept up to date. WordPress recently had a major release and can cause conflicts with older plugins.
If you have concerns about updating or deleting plugins, we recommend taking a backup of your site and working on it in our Cloud WordPress environment so your website stays safe and unbroken. You can learn more about this process here: https://www.boldgrid.com/support/total-upkeep/using-total-upkeep-to-migrate-wordpress-for-staging/
Thanks,
Nicole