there are tutorials and documentation covering every aspect of this.
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enter a second condition that says only play animation when walking, ELSE(special condition) add another event that says if player is walking(invert this condition) set animation to standing
btw, if you post a screenshot of the code, or just the actual cap file itself
you can usually get very helpful help
I'd suggest reading through Deadeye's platfrom school in the tutorials section of the forum.
Hope that helps.