まるでコロナがないかのようだった！ - It was as if there was no corona/covid もしくは It was as if we weren't in a pandemic.
Pandemic - パンデミック(世界的大流行)
コロナ禍 - Coronavirus pandemic
It seemed as if we were back in pre corona/pre covid times - コロナの前と同じように見えた。
Example
When I went to ... It seemed as if I was back in pre covid times.
When I went to ... It was as if we weren't in a pandemic.
When I went to ... It was as if there was no corona.
イギリス 
