[thesz]

Let me quote the first one, which is meta-analysis: ". Of the articles published prior to the COVID-19 pandemic, 79% (n = 19) demonstrated that work-from-home increased productivity and performance whereas 21% (n = 5) showed mixed or no effects. Of the articles published during the pandemic, 23% (n = 3) showed positive effects, 38% (n = 5) revealed mixed results, and 38% (n = 5) showed negative effects."

So it seems that there are numerous studies that show WFH is beneficial to productivity, that are done before pandemic.