hi @impurnendu,
sorry for the delay in response due to support holiday.
for the issue please share your credentials with us we will make make a video on your site that how to edit the pages with elementor.
elementor is supported by our theme. no need to worried about it. this is not an issue.
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You can edit the Demo pages via the page builder by clicking on the Edit page.
Please refer to this Video : https://www.youtube.com/watch?v=-QSrx1sNkQM
1. Click on Edit Page : http://prntscr.com/ff0ayn
2. From the page builder you can edit the pages : http://prntscr.com/ff0b3p
3. You can also embed our demo pages in the visual composer and then edit them using the visual composer. For this please refer to this Video : https://www.youtube.com/watch?v=_Acg6DOLrd4
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i recommend you to please refer to this tip:
https://wplms.io/support/knowledge-base/elementor-templates-for-demos/
and
https://wplms.io/support/knowledge-base/elementor-integration/
if this all doesn't help you achieve your desires then share credentials in private reply. we are here for your help.