Can you try to reformulate and/or use/make an image I'm not sure if I follow
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| |===========================| |---------MENU BAR----------| |===========================| |---------MENU BAR----------| |===========================| |---MAIN----------|-C1-|-C2-| |DRAWING----------|---------| |----AREA---------|=========| |-----------------|---------| |-----------------|---------| |-----------------|----LIST-| |===========================| |---------------------------| |---------------------------| |-----empty area------------| |---------------------------| |===========================| |
Depending on how often there is user input you could just go with passive rendering