New tempo detection question

Yesterday I did a tempo detection analysis of a track and then went to advanced and applied set tempo definition to track. Then I deleted all the points and it would play at any selected tempo.

I thought I saved the project with a name variation (I add the date). but today I only found the original name and wondered if I had saved the changes. I opened and it appears to play in time solidly, but I thought I would check with tempo detection analysis. I got a message that it is in musical mode and to turn off. I went to the track and switched the note icon to clock and got the same message. So is it that once you do that procedure, it is unchangeable, even if you find it didn’t succeed with the whole track?