Hi davidedpg10,

Perhaps you can update the current theme or create a new theme to achieve this. In this example, I have to make changes to the "Theme_Desktop.css" file for the Lithium theme, this file is located here "C:Program FilesK2K2 smartforms RuntimeStylesThemesLithiumTheme_Desktop.css". After updating the below elements, I would recommend restarting K2service/iisreset, and clear browser cache. The good thing is this change will not impact other themes, and other "devices". (Like: iOS, Android, "regular" screens) as it's specific to desktop theme. 

Sample:

theme-entry a.Hyperlink-NotSet.disabled
{
font-size: 5.2rem;
}
:
:
.theme-entry .input-control a.input-control,
.theme-entry .input-control.select-box.double-buttons .input-control-m-c
{
min-height: 5.2rem!important; /*override - inline style*/
}

Hello  @davidedpg10 ,

In adition to the resources given,

Perhaps you could try expanding your limits and by trying custome themes:-

Creating a Custom Theme:

https://help.k2.com/onlinehelp/k2smartforms/devref/4.7/default.htm#Creating_a_Custom_Theme.html

Deploying and Registering Custom Themes:-

https://help.k2.com/onlinehelp/k2smartforms/devref/4.7/default.htm#Deploying_and_Registering_Custom_Themes.htm

You can cusotmise customise your css:

https://www.youtube.com/watch?v=aHo7VVveXzM&t=3s

Hi  @davidedpg10 ;

At this moment we don't have OOB feature to alter k2 control side and it will be great functionality to click /or drag manually on view/form designer to decrease/increase the size of our K2 control especially on toolbar(https://help.k2.com/onlinehelp/k2five/userguide/5.0/default.htm#Create/Views/CreateViewLayout.htm) , and for that to be considered on the K2 future products, kindly log feature request at our ideas portal(https://ideas.k2.com/).

and alternatively as workaound pressumed it's custom radio button you can also add it as expression on the data label e.g(<input type="radio" name="radio" value="" style="height:35px; width:35px; vertical-align: middle;">) adjust your control size.

I hope you can find closure!

Kind Regards;

Widson.