I have been having the same problems for a long time. First try these tips from riot. Second, play around with your resolution in game to see if that helps. These first two things seemed to correct for 90% of the problem for me. But I would still occasionally have problems.
Video sobre problema com mouse no jogo League of Legends e solu莽茫o.Caso seu problema tenha sido resolvido ou voc锚 tenha outro problema, deixe nos coment谩rios

El cursor del rat贸n no aparece en el juego. A veces, al comienzo de una partida de League of Legends, desaparece el cursor del rat贸n. Normalmente esto tiene que ver con la configuraci贸n del rat贸n en Windows. A continuaci贸n ten茅is instrucciones para resolverlo. Ajustar la configuraci贸n del rat贸n. Haced clic en Inicio. Seleccionad Panel

LoL says in the Summoners Rift video "We want you to fight the enemy team, not the game". With the current in game mouse cursor, it feels as though I am fighting the game and I have a difficult time trying to play. If LoL could release multiple in game cursors, this would hopefully solve this issue. Thanks, Ben.
The mouse model could be important, if it has a button on it that changes the DPI and you're accidently pressing it. Like most modern "gaming" mice. I have a "sniper" button right where my thumb is resting on my mouse, which cuts my mouse's speed to 1/10 its normal speed. Could easily be pressed in the heat of gaming.
67 Share 24K views 3 years ago As of preseason 11 there has been a new bug where you can't see the proper indicator when pressing A click, the simple solution is to go to settings and turn on/off

League of legends dual monitor problem. Mouse leaving the screen. When I play another game, specifically Black Desert Online, and play League of Legends at the same time my mouse leaves the League the window and goes to my second monitor. This has never happened before, I've tried playing League in windowed mode and full screen but the mouse

Seems to be a longtime bug in the game where having two monitors will cause your mouse to leave the league of legends window. Pressing F9 twice fixes it. One press will give league a red border and forces it into a mode where your mouse is supposed to be able to leave the window, pressing it a 2nd time disables this mode and locks your mouse
This article should help explain and resolve most of the issues that you might encounter with your mouse and keyboard in League of Legends. Common Symptoms. Mouse cursor is not visible. Can type in in-game chat but, cannot cast spells or use champion abilities. Your keyboard bindings are not working. Custom mouse and keybinds not working.
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  • league of legends mouse cursor problem