A floating profit figure is an emotional instrument, not an analytical one. Watching it converts every tick into a gain or a loss against an reference-point that has nothing to do with the setup.
The behavioural effect is consistent. Winners get closed at whatever dollar figure feels like enough, losers get held because the number is uncomfortable to accept, and size gets judged against the swing in currency rather than against risk. This is myopic-loss-aversion with a live feed.
Hide it. Most platforms allow the account and position value columns to be turned off, and trading in r-multiple terms with pre-set exits removes the need for the number entirely until the trade is closed.
Related: myopic-loss-aversion, mark-to-market-anxiety, reference-point, disposition-effect