Notitia
Position sizing is the rule that separates trading from a lottery: you first decide how much you accept to lose if you are wrong, then work out the quantity to buy.
After 10 losses in a row, the account keeps 90 % of its value at 1.00% risk, against 60% at 5%. The stop sets the size, not the other way round.
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The fixed-risk method (often 0.5 to 2% of the account per trade) ensures that a losing streak, which is unavoidable, does not damage the account beyond repair.
If the stop is hit, the account loses 1%, no more.
After ten losses in a row, an account risking 1% per trade keeps about 90% of its value; at 5% it keeps only 60% and needs a 67% gain to get back. Losing streaks happen even with a good method.
Where the trade idea is proven wrong (below support, beyond normal volatility), never at an arbitrary amount. Size then adapts to the stop.
The rule is the same: leverage changes the margin tied up, not the loss if the stop is hit. It does bring the liquidation price closer.