Restart the device
As soon as it begins to boot, press and hold the appropriate key or button for your device
Windows PC: hold Shift while selecting Restart, then choose Troubleshoot, Advanced options, Startup Settings, Restart, and press the Safe Mode key
Mac: restart and immediately hold Shift until the login screen appears
Android: press and hold the Power button, then press and hold Power off, and tap Safe mode if available
iPhone: iPhones do not have a standard Safe Mode for normal use
If you want, tell me your device model and I can give the exact steps