Just upgraded the Mac OS to Big Sur 11.4 and noticed a few things missing in Safari when using the Develop > iOS device A number of tabs that are missing. When inspecting a page from an externally connected iPhone, the only tabs available are Console, Sources, and Audit. Right clicking for a list of additional tabs (e.g. Elements, Network, Timelines, Storage, Graphics, Layers etc) turns up only those three times.
Also it's not possible to run JavaScript commands in the console.
These issues only affect a pages being inspected on the iPhone. Inspector for regular pages (hosted on the local machine) in Safari work as normal.
This seems to be a result of having upgraded to MacOS big Sur 11.4
Thank you for reporting this problem. It is now fixed in Safari Technology Preview 125, which you can download at developer.apple.com/safari/download
