Hi @Glueck ,
If your table headers are fixed you can create a template file with the headers create a new file with the headers and avoid the create table action in your flow.
After that you have to iterate over the array that you are getting from the Select operation.
So , after Select operation use an apply to each loop , add the select array into it add a compose action inside it and write item(). The compose action is optional , this compose will show you the data that you are trying to add. Now after the compose you can use the action add a row and pass the same object(row) or use output of compose action in that array.
Refer the below screenshot.

The Add a row action takes time to execute based on how many objects are there in your array. If you have a large dataset then you can consider using office script and adding the data to a blank excel file , refer the below link for more details.
https://www.youtube.com/watch?v=4g8Lh0gzEnc
Hope this helps!
Thanks,
Sanmesh