Emergency rules explain the added flexibility in how the employment department defines availability to work, actively seeking work, and able to work. And the definitions are tightly connected to Covid-19 related reasons (listed above). However, being in close proximity to the public is not a COVID-19 related reason.
As long as your workplace can follow social distancing guidelines issued by government or public health officials, and the person does not have a COVID-19 related reason for returning to work, they are considered able to work. Choosing not to return to work would affect their unemployment benefit eligibility. The resource we refer to for guidelines issued by government of public health officials is the Governor’s COVID-19 Resources for Oregonians website https://govstatus.egov.com/or-covid-19