In order to allow your symbols resize according to its content, make sure that you enable this feature as shown here:
No more Whack-a-Mole. Make your buttons dynamic by using Padding.
Padding makes your buttons resize themselves magically based on their content. No more playing whack-a-mole with dozens of buttons that have to be resized each on its own. Simply set Padding once, and Anima will take care of the rest.
Learn more about Padding.
Get started with these tutorials: