In the Default.sublime-theme
file do a search for height. You will find a field that displays "tab_height": 35,
and change that value to your desired tab height.
In Sublime Text 3, the easiest way to find the file is use Package Control and install the PackageResourceViewer
plugin to search for the Default.sublime-theme
file.
Actual format to be used:
[
{
// Tabs
"class": "tabset_control",
"tab_height": 35,
},
]