Does one of the style properties control this?

.p-header-logo.p-header-logo--image img {
max-height: 50px;

The max-height defaults to 200px but we'd like to set it to 50px
No property that's default XF CSS. You can overwrite it via extra.less:

.XenBase .p-header-logo.p-header-logo--image img {
max-height: 50px;

Technically the way XF approaches the logo now is ideally your main logo should be the correct size out of the box, then have a second logo you set that's 2x the resolution of the default one, set it by going to: Style Properties -> Basic Options.

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