Can I change theme color on GX?

I loved the normal opera browser, but for over 1 week straight now I continued getting a memory leak from Opera. Opera would use 8gb or more just having 1 tab open. With normal Opera open, I have 86% ram usage. With normal Opera closed, I have 30% or less

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Themes and colors? : r/OperaGX

Any way to change the colors of the Opera browser? : r/operabrowser