There is a "stack" option in the matrix menu when you are in math mode. I usually use this to have multiple lines in summations subscripts, etc... I think it is the purpose.
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On 25. Mar 2020, at 16:01, Frank <address@hidden> wrote:

Dear all,

I wonder what is the suggested way to put multiple lines in subscripts / superscripts. Currently I insert a tabular. I don't know whether there are more canonical way to do this.

Best wishes,

Frank