After Running the analysis under the Results tab defined envelope not showing
When you select the Envelope option, the enveloped results will be shown. The enveloped results are shown for the active Envelope, which can be selected by clicking on the Select Load Case icon in the Results menu.
this option known to me but I am talking about which was I highlighted in the second picture why it is not shown there
This dialog is not meant to show all created envelopes. It just allows you to show the enveloped results of the active envelope selected in the Results Setup dialog as I showed in the previous screenshot.
Only two envelope are there one for strength and one for service and both are not shown there
Yes and it is not supposed to be shown there.