Old Hippie,
it looks like you have a filter string active, so ultimately no soloist is displayed. You should have nothing typed in the line "Filter String" (just click on "Show All"), then all possible soloists are displayed.

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Biab/RB latest build, German Language Pak, Win 10/64 Pro, 1 TB SSD, 32 GB RAM. Notation SW Finale, StaffPad, SmartsScore – Playing Double Bass, Guitar, Piano