How to remove login window on the frontpage

this feature might be added by a plugin or could be part of your theme.

try to temporarily deactivate all plugis to see if that removes the login window; then reactivate one plugin at a time and test each time, to locate the one that might have been causing the problem.

ideally, please ask in your theme’s forum at https://ww.wp.xz.cn/support/theme/dine-with-me#postform to get theme specific suggestions.