There is rather a rich set of the display features, you can define for specific syntax.
The similar set of the settings can be also maintained for a specific document with the help of menu View → Editor (file specific). Such document specific settings have priorities over syntax specific settings.
Getting to this page rather tricky and is not obvious

. You need to click on the main node of the syntax, that you want to change.
You can also define syntax specific line spacing mode/value, as it done on example for Plain Text syntax.
Following line spacing mode can be maintained:
Single - standard line spacing size, defined by font name/size
1.5 lines - line spacing value 1.5 time larger than standard (single) size
Double - line spacing value 2 times larger than standard (single) size
At least - in this mode, you can define minimum line spacing value (in display points - pt), not dependent from font size/name
Exactly - in this mode, you can define exact line spacing value (in display points - pt), not dependent from font size/name
Multiple - here you can define manually by which factor line spacing value will be larger than standard (single) size
Display settings for syntax, in compare to font setting are not inheritable from parent syntaxes. If you want to change settings for all syntaxes, use corresponding All Syntax node