High mysqld.exe RAM consumption after single action in HeidiSQL

I notice high RAM consumption after single action in HeidiSQL. After startup MariaDB service takes ~380 MB in RAM. Then It keeps same amount of memory for hours. Then I connect to DB using HeidiSQL and click to expand Views branch in tree component.
I can see command executed displayed:

SELECT `DEFAULT_COLLATION_NAME` FROM `information_schema`.`SCHEMATA` WHERE `SCHEMA_NAME`='mydb';

SHOW TABLE STATUS FROM `mydb`;

SHOW FUNCTION STATUS WHERE `Db`='mydb';

SHOW PROCEDURE STATUS WHERE `Db`='mydb';

SHOW TRIGGERS FROM `mydb`;

SELECT *, EVENT_SCHEMA AS `Db`, EVENT_NAME AS `Name` FROM information_schema.`EVENTS` WHERE `EVENT_SCHEMA`='mydb';

At that point mysqld.exe process takes 2749 MB RAM. Then I disconnect DB in HeidiSQL first and close the program itself. The server process keeps holding 2749 MB RAM.
Is that normal? How can I investigate memory issues? Can I force to release RAM without restarting service?
MariaDB version 11.4.2 on Win64.