Yes, you can.
For configuration instructions, please refer to the applicable manual.
▼Limit Login to SSO / Remove Limit (Web Browser)
https://teachme.jp/8/manuals/51167209
※ The restriction applies to General Users.
Administrators and Sub-administrators can also log in with their Account name and Password via a Web Browser.
For the Teachme Biz, Teachme Player, and Teachme MySkill mobile apps, Administrators and Sub-administrators will also be limited to single sign-on login only.
※ It is not possible to apply the restriction only to specific General Users or specific apps, or to exclude certain General Users from the restriction.