The COVID-19 Pandemic has significantly changed the delivery of care through new workflows and models of care. However, the impact of these changes on the usage of electronic health record (EHR) systems remains unclear. This mixed method study aims to understand how EHR usage patterns changed between the pandemic onset and the pre-pandemic period at a Canadian mental health hospital, using an analysis of EHR usage log data and a qualitative focus group. An increase in after-hours EHR usage and documentation time per patient was observed, as well as a decrease in order time. Virtual care (VC) use also had an impact on time spent per patient within the EHR and after-hours EHR usage. Qualitative results highlighted physician concerns related to VC workflows and documentation, which contributed to additional EHR burden. Future work should focus on different contexts and developing relevant interventions to address these issues.