How to hide "top-right icon on the header" of ChannelList & Channel

Hi, I just started to use sendbird with the version below.
“sendbird”: “^3.0.148”,
“sendbird-uikit”: “^2.2.1”,

My Question is…
How to hide “top-right icon on the header” of ChannelList & Channel?

I want to add custom buttons, but even though I render header as “null”, it still shows the icon.

In the ChannelProps, it has “onChatHeaderActionClick” but not about showDefaultActionIcon like “showSearchIcon”.
Is there any way to hide them?