From man zshoptions

HIST_VERIFY
    Whenever the user enters a line with history expansion,  don't  execute  the  line
    directly;  instead, perform history expansion and reload the line into the editing buffer.

To disable this option run setopt no_hist_verify. You can also have a look at your config file and remove the hist_verify option or just explicitly disable it.

From man zshoptions

HIST_VERIFY
    Whenever the user enters a line with history expansion,  don't  execute  the  line
    directly;  instead, perform history expansion and reload the line into the editing buffer.

To disable this option run setopt no_hist_verify. You can also have a look at your config file and remove the hist_verify option or just explicitly disable it.