My workout indoor walk has changed from open goal to 90 calories. I track miles. Help

Just before your next workout do this;

On the workout type tap on the 3 dots top right corner and tap on Open then start a workout and when you've finished tap on end,the watch will remember your last setting and next time you do a workout it should be set to open goal.

I had a similar problem, only mine is stuck on minutes (10 min) I close open the next workout and did a 50 minute walk. The default is still 10 minutes). I would prefer an open goal but can't seem to get the work out back to that. I even deleted the workout and added it back in - still 10 minutes.