Ciao Cepe,
thank you for the hint on filters, I haven't recognized these until now.
I've played around a bit (with v1.11.2944), but had no success.
In an empty (new) survey, I imported data from PocketTopo (data + sketch). If I draw any other object (e.g. a new cave border in the Border layer), and then create filter with propery "import_source" = "pockettopo",
all objects are filtered - also my "new" object which definitely doesn't have "import_source=pockettopo" (I've checked that in the Properties panel).
The Whiteboard mode looks very interesting though.
Do you have any documentation on that? (in the PDF I haven't found anything)
The imported sketch quality is excellent anyway, it's just at the "wrong" layer
For me it's perfectly fine if you can import the drawings as generic objects into the sketch layer.