How to change font size in theme?

[fbrundu]

Hi, I am trying to change font size of interface text. I was searching for the .sublime-theme file for spacegray (I read this https://www.sublimetext.com/forum/viewtopic.php?f=2&t=7411 ) but I am unable to find it on my file system, I found only a base16-ocean.dark.tmTheme.cache file.. How can I achieve that? Is it possible to do?

Thanks

[CharlyMTO]

Use "spacegray_sidebar_tree_large": true, "spacegray_sidebar_font_xlarge": true

[fbrundu]

Hi, I am unable to change it. Where do I have to put it? In addition, is it possible to change font style? Thanks

[salttis]

Just put them in your User preferences.

[alexlime]

Settings are working. Cannot set tabs size or sidebar font size.

[joonro]

I put the following:

    "spacegray_tabs_font_xlarge": true,
    "spacegray_tabs_xlarge": true,

but the tab font or size did not change.