Secondary fermentation - Head Space?

Yeast & Fermentation
1

I am concerned for my second brew attempt.
All was well during primary fermentation of 2 weeks on my Kolsch extract from NB.

I transferred to secondary after 2.5 weeks and am concerned that my secondary Glass Carboy has too much head room. I went from Primary of 6.5 gallon carboy holding the 5 gallons and transferred the 5 gallons to the secondary Carboy that is also 6.5 gallons still leaving 1.5 gallons of head room.

I have read, after the secondary rack of course, that this is NOT recommended as the beer can get too much oxygen, leaving bad taste in finished product. Can I mitigate any possible damage and save this brew? What should I do? Should I wait it out the remaining 3 weeks in secondary? bottle in a week? or ?

Any help is greatly appreciated.
Thanks

2

Relax. It will be fine. The beer, after primary has co2 in it that was released after you racked and probably forced most of the oxygen out of the carboy