As you can see, you see nothing :-). Just space. That’s what the spacer does.
The Spacer macro simply adds some vertical space to your page. Sometimes you just want some vertical distance between two paragraphs or images. Confluence removes empty lines so that doesn’t work.
Just add a Bootstrap Spacer. It defaults to 20 pixels in height but you can of course change that.
Edit your page.
Select “+” => Other macros
Type in “Bootstrap” in the Search box
Select the “Bootstrap Spacer” macro