You can use Auto risk with a value of 1 or Fixed Lots.
You can learn more and find examples here: https://www.trade-copier.com/index.php/component/cockpit/?view=v4&layout=tutorials_copier_settings&article=fixed-lot-or-unit
Here you can find examples of Auto Risk settings: https://www.trade-copier.com/index.php/component/cockpit/?view=v4&layout=tutorials_copier_settings&article=auto-risk-proportional-risk