The dashboard is based on https://material.angular.io/ and therefore the core dashboard nodes are committed to the material design scheme.
Your feature request is totally valid but I believe will not be implemented (I asked a similar question before). Especially because the lifespan of the dashboard is not endless: [ANNOUNCE] Node-RED-Dashboard 3.0.4
I'm also not happy with all rules in the material design scheme (especially buttons screaming at the user in bold capital letters) but: "You make the rules to beak the rules" - and that is why you can use the template node to play around with most aspects of the dashboard.
Sorry
And it is totally ok to ask! Sometimes the answer is not satisfying. I only tried to point you to a solution.
Chris
