Some common OceanWP settings for Woocommerce buttons for product and archive pages.
OceanWP Woocommerce general button colors.
Go to General Options/Theme Buttons
To Change Colors of Related Products :Add to Cart button; at bottom of indiv. products pages
Scroll to Product Entry: Add To Cart
Woocommerce Description Tab colors on Product Pages
Scroll to Single Product: Tabs (last 1/3 of scroll)
Elementor Error when Editing
Make sure to try turning shop page to draft, or change shop page temporarily to another page in Woocommerce. Edit in Elementor, then change page back to main store page or even try leaving that setting blank. Woocommerce/Products/Shop page.