I have installed other bars designed by Hextom, can they work together with Free Shipping Bar?

All the bar Apps (FSB, QAB, ECB, CTB) can work together. If you would like to have more than one of them to display on the same page at the same time. There are 2 methods,
1. Please them at different positions; for example one at the top and the other at the bottom.

Shopify App - Quick Announcement Bar by Hextom - 2 Bars
2. You could use the "placeholder" option, last one under the "position" settings in the bar configuration. With this feature, you could place both bars to the desired positions in your theme.

Step 1: Select the placeholder option (last one under the "position" settings) in all the Apps, and then save the change

Step 2: Go to Admin > Online Store > Themes

Step 3: Click the "..." button on the right hand side, and select "Edit HTML/CSS"

Step 4: Click "theme.liquid"

Step 5: Copy and paste the placeholder HTML code included in each App to the desired positions in the theme

Step 6: Click "Save"

Check it in action Here

Shopify App - Quick Announcement Bar by Hextom - 2 Bars