First check whether you published. Everything you change in the Live Page Builder stays in your draft: the colours, the fonts, the sections, the header and the footer. Your customers keep the old shop until you press Publish. When something is waiting, the button carries a small amber dot, and Changes beside it lists exactly what differs from the live shop.
If you did publish and your shop still shows the old look, open the menu with three dots at the end of the builder's top bar and choose Purge storefront cache. Then reload your shop page in your browser once.
Two things do not wait for Publish. Your navigation menus go live when you press Save Menu. The two WhatsApp switches, Floating widget and Show on product pages, are store settings and go live when they are saved. If you changed one of those, you see it on your shop straight away.