I open the tubes I want in the TDC (F6) screen. Just don't select a tube again in the Periscope or UZO screen until you've fired a tube.
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GWX 3, JSGME 2.3, Sh3 Commander 3.2 SH3 Gen 8.1, Water Stream for U-boats, LRT LITE 2.0, Lifeboats for SH3
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