Unfortunately, if you choose the "Text" or "Logo + Text" design style, you cannot change the font size or spacing.
However, if you wish to freely adjust the size and spacing of the logo and text to make your sign, please create a single artwork file by yourself, then select the "Logo" design style and upload the file.
We provide Illustrator templates tailored to each sign size, but you can also use other tools to create an artwork.
In that case, please check the recommended resolution on the file upload instructions page.