Hi Alena.
Add class to the column containing navigation.
For example sticky-col
And use following code
.body-innerwrapper {
overflow-x: visible;
}
.sticky-col .sppb-addon-wrapper {
position: sticky;
top: 100px;
}
Best place for this code is custom.css file in Helix
So I have to create an element with the exact ID for each article :(
Then all that you need to add sticky-col class to the column each time when you create new article. Or you can save whole section and use it as template when create new article.
P.S. Showed by SPPB 3 example . In SPPB 4/5 all the same