The debug sequence starts with launching the openocd as debug server to communicate with the debugger probe, then connect gdb to openocd, flash the binary and running initialization sequence. No memory verification is done in debug mode.
On the new perspective, the debug session is listed on the left « Debug » view. The usual debug command are in top toolbar.
On the right panel, the view Peripherals shows the BlueNRG peripherals (information parsed from SVD) and allow to visualize and edit there registers/fields.