[Issue] Sidebar long title content line spacing take same as for between two different contents

[ghost]

If sidebar certain content or sub-content has a long title then it takes line space same as between two different contents
Flex theme has option for change that line space but it applies to all so useless.

source: https://forestry.io/docs/welcome/
https://github.com/forestryio/forestry.io/

It must be look like this and if main content title font size large or bold than subcontents; it might more better.