如何自定义表情符号预览大小并移除默认表情符号

The default emojis were rarely used, I hope to remove all default emojis and only retain the customised emoji.

Is there any way that I can put the customised emoji at the top, or remove the default emojis?

In addition, may I increase the size of preview of emoji? The preview size used to be large, but after one update, all emoji previews become as small as the image below.
image

Helps and replies are greatly appreciated, thank you very much!

这实际上会很不错