Hi,
You can change the column width of these options under here: https://i.imgur.com/34pcztv.png
The options drop down and header fonts can be changed here: https://i.imgur.com/UntmDvF.png
In some cases those fonts and colors might be inherited from the theme, in that case, using custom CSS is the only option:
/* The option labels font color */
fieldset .asp_option_label,
fieldset .asp_label {
color: red !important;
}
/* The header font color */
.asp_sb fieldset legend,
.asp_sb fieldset legend {
color: blue !important;
}