First, sign into your Shopify store admin.

Open Reactiv Dashboard by going to Sales channels > Reactiv - Mobile App Builder.

You will be redirected to the app studio where you can start designing your homepage.

Drag the "Featured Products" section to the preview area.

Use the settings area to configure the content and design of the section.

Scroll down and click on Add Collection button, then select as many collections you want to display in the home page.

Products from the selected collections will automatically be pulled in and displayed under tabs. Customers can easily switch between tabs to browse through the products without leaving the page.

You can further customize the style of the product images card to be square, portrait or landscape depending on your brand's style.

You can also adjust how the images fit by changing the Image Display Style.

Finally select how many products from each collection should be shown by default. If there are more products in the collection a View all button will automatically appear.

All your changes will reflect in real-time in the preview area.