select 2 or more segmen line , use CLEANUP 3 , chose REPAIR EDGE.
and BOOM!

THE BASIC PLUGINS ARE LESS EXCITING, and their functions are less than optimal, such as solid tools, which are very difficult to cut or combine a rather complicated object, section tools cannot be on 2 sides at once. Hopefully there will be improvements, such as collaboration or acquisition with third-party plugins such as the fredo6, midnight stuido, booltools or flextool plugins. and hopefully the UI will change completely to be like blender or 3d plasticity. that's what you call a cool update.