Bootstrap 5 (update 2021)
Bootstrap 5 is still flexbox based so columns in a row are equal height. Therefore d-block can still be used to “disable” flexbox and use float-start
to float columns.
Bootstrap 4 (original answer)
Yes, you can use d-block
on the row, and float-left
on the columns to make it work the Bootstrap 3.x way with floated columns instead of flexbox..
<div class="row d-block">
<div class="col-lg-3 float-left">
..
</div>
<div class="col-lg-9 float-left">
..
</div>
</div>
https://codeply.com/go/Ghhq1NbMDG
Related:
Bootstrap 4 Columns float style like Bootstrap 3 is it possible?
Empty vertical space between columns in Bootstrap 4