Office activation for creating presentations

Greetings colleagues, I bought a laptop to prepare presentations for my lessons, but an unfortunate situation has arisen. Windows 11 constantly reminds me to activate it, covering the text with messages, and PowerPoint only works in view mode, so I can't add any slides. My teacher's salary does not allow me to buy the full Office package right now. Is there a safe way to unlock the programs so that I can prepare for classes normally?