Documents mentioned in the video: Page Targeting for Heatmaps
Solution: In order to track all pages within your site using Heatmaps, you would need to create multiple Heatmaps.
Using the targeting rules "simple" and "exact" are ideal for targeting one page at a time. While targeting rules such as "contains", "starts with" "ends with" and "regular expressions" are for targeting multiple pages that share the same template (for example, product pages or blog posts). With Events you can trigger the Heatmap when a user takes a certain action like clicking a button.
You can find more information about that here: Page Targeting Explained for Heatmaps.
Your Heatmaps may be based on continuous capture
If you are on a Hotjar Business or Plus plan, your Heatmaps are based on continuous capture by default. As we transition to Continuous Heatmaps, you will still have access to manual snapshot-based Heatmaps as well. Learn more about Continuous Heatmaps.