Dear, 
When I would like to hatch or create a close contour with the function contouraire for a big zone => 
1. for small zone it's ok
2. for a medium zone ... If i wait and sometimes I zoom in and out it's ok
3. for a big CLOSED zone it's not ok => it's a closed zone because when a split the zone with several smallest zones => it's OK
I had found the solution in previous version of draftsight with some setting parameter like hpmaxcontourpoints or maxhatchdensity ... but I have upgraded to new DraftSight Pro 2021 x64 SP2, and I don't remember the correct parameters 

Can anyone help me please, many thanks