Create list , then save some point inside.
When i try to add new point list not showed in list 
u should refresh page to see him inisde
Hi @DenisLV can you try following the directions at https://support.google.com/maps/answer/7280933 and see if it works for you.
To help more we’d need to know if you’re on phone (Android or iPhone) or desktop and the version of Maps.
Paul
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hi @PaulPavlinovich that works, but u should always refresh the page after the new list is created to show him on the side panel.
Try to make new list, save point, and then add a new point to new list