same here. On My OS: macOS Big Sur, 10.15.7 Xcode: 12.5 Safari: 14.1.1(16611.2.7.1.4) And I download at developer.apple.com/safari/download Safari Technology Preview 125,but same issue.

I can customize which tabs appear in the menu. TO do so, right click next to an element and I only have: Console; Sources; Audit;