Add the following code in Customize > Additional CSS:
.class li { list-style-type: disc !important; list-style-position: inside !important; padding-left: XXem !important; text-indent: -XXem !important; }
If it does not work, try replacing em with px or target ul li / ol li instead of just li.
Source: https://stackoverflow.com/questions/33362748/li-item-on-two-lines-second-line-has-no-margin and https://stackoverflow.com/questions/11556493/2nd-line-in-li-start-under-the-bullet-after-css-reset