Unable to click and drag to highlight

Several times I have encountered this issue where I attempt to click and drag to highlight code, but R Studio won't allow me. The issue is intermittent and can usually be resolved by restarting R Studio, but it is nonetheless quite frustrating.

I suspect it happens when I erroneously click something or use the wrong keyboard shortcut, but I have no idea what I might have done in order to reverse it. Has anyone else encountered this?

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