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Is there a way to make the health bars bigger/larger? Is there a way to make the unit info panel remain visible when a unit is selected but the mouse cursor is not over it?
I don't know exactly about your first question. For the second question, I think there is an option in the in-game menu to display unit-stats. Have a look at the Ui & Interface menus.
I think I saw some console commands to adjust the size of the health bar
I tried these commands but they didnt work: -ui_LifebarWidth -ui_lifebarHeight
And for the unit info panel i couldnt find it in the options menu