Syntax:
ALTER
    [ALGORITHM = {UNDEFINED | MERGE | TEMPTABLE}]
    [DEFINER = user]
    [SQL SECURITY { DEFINER | INVOKER }]
    VIEW view_name [(column_list)]
    AS select_statement
    [WITH [CASCADED | LOCAL] CHECK OPTION]

This statement changes the definition of a view, which must exist. The
syntax is similar to that for CREATE VIEW see [HELP CREATE VIEW]). This
statement requires the CREATE VIEW and DROP privileges for the view,
and some privilege for each column referred to in the SELECT statement.
ALTER VIEW is permitted only to the definer or users with the
SET_USER_ID privilege (or the deprecated SUPER privilege).

URL: https://dev.mysql.com/doc/refman/8.0/en/alter-view.html

