problems with the navigation elements

PC View: If a sub-menu item is inserted in the main menu element, this is not visible in the main menu. In the Mobile View, an arrow element is correctly displayed next to the main navigation (galleries) to indicate that there is still a sub-menu. Tablet View: In Tablet View, the main menu item is not kept open to tap the submenus. After tapping on the main menu (Galleries), the menu closes again. Please fix both problems, they are due to the theme (full frame pro) with other themes this works correctly. My website: https://www.marcel-tujetsch.ch/ Translated with www.DeepL.com/Translator