Highlight folded line

[FeelUs]

Is there way to highlight folded line or more bright show folded regions?
It is very difficult to find little yellow rectangle with three dots.

For example notepad++ underscores whole folded line.

[deathaxe]

Lines containing folded regions are not scoped in special ways, nor does ST support highlighting them in special ways.

Your best options probably are

1. to customize your theme to more prominently tint the fold button on the left.
2. create a plugin, which adds a gutter icon to each line containing a folded region.

That said, I personally find such horizontal lines ugly.