So to answer our own question, you go into the CSS for the component and change it there. I would like to see this as default (font-size:1rem) and if you really want to change it, then you can do this. In the meantime:
.ia_inputField {
font-size: 1rem;
color: var(–neutral-90);
border: var(–containerBorder);
background-color: var(–input);
padding: 0px 0.5rem;
border-radius: var(–borderRadiusInput);
}
for DateTimeInput component (input-field.CSS)
and
.ia_dropdown__search {
color: var(–label);
font-size: 1rem;
}
for Dropdown (ia_dropdown.CSS)
This was taken from “light” theme. You will need to create your own theme with the instructions to do so in the readme in the themes folder under data/modules/com.inductiveautomation.perspective/themes