These steps are for MT5 on desktop. Menus differ in the web and mobile versions.
In Market Watch, right-click the instrument.
Choose Specification.
The Specification window shows:
the spread, and the contract size (the number of units in one lot)
the smallest and largest trade size, and the step between sizes
the stops level: how close to the current price you can place a Stop Loss, Take Profit or pending order
swap rates for buy and sell positions, and which days are charged extra
trading sessions for each day of the week
commission, where it applies
margin requirements
Margin figures are worked out when you open the window, so treat them as a guide. Close and reopen it for updated figures.