If you turn off dark mode and reapply the theme in light mode, it should apply the theme to everything. I just tried it on my Note 10+ and it worked. Hope it helps you also.
I have the Note 20 ultra and had to turn off dark mode and set it back to the default bright mode and BAM! all the theme settings changed like it showed it would. Try that cause I had that issue as well an paid for 2 themes. Good Luck hope it works for you too