Lapce has a unique feature called Code Lens. It's a mixture of folding, minimap and code outline, with the content of functions rendered in very small fonts. You can toggle it by Ctrl+e in Windows and Linux, and Cmd+e in macOS. If you've got modal editing enabled, you can also use the spacebar to toggle it in Normal and Visual mode.
It's still a fully editable area that you can edit like a normal editor, with the benefit of easily shifting functions or structs/classes around the file.
You can also change the font size of Code Lens in settings.