Most-Exposed Direction is the Dashboard wording used to show the symbol and direction where your account has the highest directional concentration.
For example, the Dashboard may show that your most-exposed direction is:
XAUUSD BUY
or
NAS100 SELL
This helps you see where your account is most concentrated before requesting a payout.
Monitored symbols are displayed from the highest directional concentration to the lowest directional concentration, so you can see which symbol and direction is contributing most to the metric.