Our office was 95% paperless well before covid and working from home came along.
A mixture of bluebeam and onenote is what is generally used for calculations and drawing markups. When I first joined the company I though I'd hate it working electronically. But I actually enjoy stringing together calcs electronically on a Microsoft surface Pro, being able to cut and paste from documents or analysis programs is super easy. I'm a big surface pencil user, preferring to write/scribble on the screen to produce hand calcs/sketches, but others are all electronically typing everything. I very much prefer the flow of my calculations as I feel the handwritten calcs show more of my thought process.
The only downsides are sometimes the damn thing gets super hot and you feel like your hands going to melt or something, and they are a bit fragile (cracked my screen the other day when I accidentally dropped my phone onto the corner of the metal surround around the screen, still works though!).
We struggled during our first lockdown in March last year to find an efficient workflow for getting markups to be drawn more than anything else. Everyone was doing their own thing for a while and it was utter chaos and markups were falling through the cracks. But this was more around the different means of communication required when you're not sitting right next to someone. Once we sorted that out with a structured methodology for markups that everyone was happy to follow and storing them religiously in our document management system using a structured naming and revision system, its been far more plain sailing. The practice has continued once we were back in the office. But most of us still work from home 2 days a week even though there are no covid cases in the country,
I personally have not printed a single sheet of paper for over a year now. We still scribble and brainstorm on paper if we're in the office, but if working remotely a teams session and drawing in bluebeam or onenote is more than sufficient.
I also created a large number of bluebeam toolsets to share with all the staff which make electronic markups much more efficient as well. Stuff like all the structural steel sections, local timber sections, local timber connection components, etc.