This is the configuration that will get what you want. Unfortunately, I don’t think making the button taller will make it look nicer ..
For tabs, especially if you are navigating across pages, you can look at the “Tabs” widget:
Which itself has as well many options, allowing for different shapes and forms.
And as highlighted above, you have alternative options based on other widgets: loop layout, metrics cards, etc.
If you are looking for more customazibility, you can look into Slate or even Custom React widget (which can be embedded into Workshop)