edebug-initial-mode

edebug-initial-mode is a variable defined in `edebug.el'.
Its value is

step

Documentation:
Initial execution mode for Edebug, if non-nil.
If this variable is non-nil, it specifies the initial execution mode
for Edebug when it is first activated. Possible values are step, next,
go, Go-nonstop, trace, Trace-fast, continue, and Continue-fast.

You can customize this variable.