Need to switch sd card to default storage on galaxy tab E. I do not have the three dots.

[zeboone840]

Followed instructions till I got to the 3 button , I don't have them

 

[webworkings]

If that step isn't there, then you can't do this on that device. Either it is using an older version of Android (you have to be using at least 6.0) or the manufacturer has restricted this option.