Indeed, in GUI, you can use the Properties window:
https://winscp.net/eng/docs/ui_properties

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If counting files remotely takes too long, and you have a shell access to the server, you can instead use Console window to calculate the files locally on the server:

https://winscp.net/eng/docs/ui_console

Found it, click on Properties then Calculate which produces bot size and number of files. Beware, it takes a while.

Newbie here, I need to count the number of remote files. Is that possible?

Thanks,
Bob