Currently the drop down menu allows you to style the displayed font but the drop down choices are not consistent with any changes made to the display font.
I would like to suggest Bubble, add the ability to reflect the designated font display size to also be reflected in the choices, a check box to enable this in the editor would give us the choice.
I’m about 75% sure the browser determines the look and feel of the basic dropdown. @levon has built a plugin to give you more control over the dropdown appearance.
Steven is aware 
Levon Terteryan
Founder @ Zeroqode & Bubblewits
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To a certain extent it is, but I am 99% sure you can manipulate font size of displayed choices in a drop down.
Ok, after a thorough investigation it appears there is a reported bug for Firefox and unless you know JavaScript creating a customised drop down font size is inconsistent, but with a better available form widget set from Bubble this would fix the style issues.
There are some options and a great article on the Mozilla.org developers website more details here if you are interested in diving into the CSS.
Note: you will need to add in a CSS Tools plugin by PlugBubble to achieve these in Bubble.
