Go to the Style Kit panel, and manage the whole typography on this layout via a number of useful controls. You can also set up your Buttons and Column Gaps.
Try experimenting with the Heading sizes, for example if you tweak the Heading 2 value, the heading title above this text must change accordingly.
Keep in mind that individual element styles override the Style Kit values, so for Style Kits to work, the element must not have manually added styles.
In the Style kits panel you also have controls for the Elementor buttons, and specifically for each of their five sizes. This helps you to consistently manage the styles of your buttons.
Try dropping a new button widget here, and turn it into a different size. You should see that each size can have a completely different size.