Simply edit the page with Elementor and in the Revolution Slider element, click on the Styles options to locate the color pickers eg: https://d.pr/i/9Qf22m .
Try editing the slider, in Revolution Slider plugin and choose the global layer, in which you can find the icons. Here’s a quick recording https://d.pr/v/R2uF5K .
Here’s a quick video recording how to deal with it https://d.pr/v/YgXbPN .
Basically this is a product page Cover, assigned in Customizer > Page Covers > WooCommerce > Product page . You can edit by accessing Rey theme > Global sections, or when in product page, to hover over Edit with Elementor admin bar menu, and choose to edit the “Product page Cover”.