Preview issues

Hello,

I did not find a topic that raised my problem with the search tool.

I’m using the free version of MailPoet.
I tear my hair out, I may use the models offered by MailPoet, impossible:
– to have a preview which corresponds to what there is in the design page
– to receive a newsletter which has the same form as in the design page, or even in the overview …

In other words: whatever I do in the design page, the result shown in preview in the browser differs from it, and it is itself different from the result received on a gmail address, which is itself different from the result received on a linked address to a standard domain (itself also different from the overview).

In other words, because it seems confusing to me: it is impossible to have the assurance that what we do in design will be what subscribers will receive.

Considering how this plug-in is praised by the community, I am very surprised!

Thank you for your help.