Hello, @Marta,
1/ Please do not show all products (-1) on the Shop page at once (Theme Options > WooCommerce > Shop > Shop page layout), it seems your server can’t handle this request for more than 1 thousand products.
2/ In order to solve your issue with the menu and Footer, please navigate to XStore > Theme Options > Speed Optimization and set Menu Cache, Static Blocks Cache, and Remove Query Strings From Theme Static Resources to Off.
Additionally, go to Elementor > Tools and click on Regenerate CSS & Data.
We hope this information is helpful.
Kind Regards,
8theme team