@mikaydengutierrez33v I too earlier was looking for a solution to change bg. colour of a navigator, TopTab in my case, but turns out React Native (language which Thunkable is based upon) itself doesn’t have dynamically changing color properties. Therefore colors / some other properties of navigators can’t be changed from blocks.
As @jared suggested to you here (and in my linked post if you open it), custom one using rows/cols. seems your only option. That’s what I went with too. Thanks!