OK, just uploaded a macro/script to reposition and resize the macOS Character Viewer.
I note that you are not running the English language of macOS, so you may need to translate/revise these statements in the script:
tell application "System Events"
set oWin to {}
set oWin to window "Character Viewer" of application process "CharacterPalette"
if (oWin = {}) then error "Character Viewer Window is NOT open"
tell oWin
set oPos to position
set oSize to size
--- CHANGE Window Position and Size ---
set position to winPos
set size to ptyWinSize
perform action "AXRaise"
These lines may need changing for your language:
tell application "System Events"
set oWin to window "Character Viewer" of application process "CharacterPalette"
if (oWin = {}) then error "Character Viewer Window is NOT open"
perform action "AXRaise"
Here's my macro:
MACRO: Set Position and Size of macOS Emoji Character Viewer [Example]
Please note that you will first need to manually open the Character Viewer window.
I have not been able to find a reliable way to do it by script. You might be able to do it using KM Found Images.
Let us know if this works for you.