Hi Veerle,

Yes, you can do this by the following process.

If you have users with standard profiles who shouldn’t get access to Lightning Experience yet? Move these users to custom profiles that don’t include the “Lightning Experience User” permission.

For users with custom profiles, decide who gets Lightning Experience. Custom profiles don’t automatically include the “Lightning Experience User” permission so it’s up to you. Consider these options.

Want to test Lightning Experience with a small group of custom profile users but you don’t want to turn it on for everyone assigned to these profiles? Create a permission set that includes the “Lightning Experience User” permission. Then apply the permission set to each pilot user. When you turn on Lightning Experience, only pilot users see the new interface.


Decide Who Immediately Switches to Lightning Experience:

The last step is to decide which of your users should immediately switch to the new interface when you enable Lightning Experience and who should stay in Salesforce Classic. You can choose what’s right for each user. If your team isn’t fully trained on Lightning Experience yet or it’s not a good time to introduce a major change, you can opt to leave everyone in Salesforce Classic when Lightning Experience is turned on.

Tip:
Remember, everyone who’s enabled for Lightning Experience automatically gets the Switcher. Meaning users who remain in Salesforce Classic can switch themselves to Lightning Experience whenever they’re ready. And of course, users assigned to the new interface can switch back to Salesforce Classic as needed.

To assign the right interfaces for your users, use the Lightning Experience Migration Assistant. From Setup in Salesforce Classic, click Lightning Experience. In the “Decide Who Can Use Lightning Experience” section, find the “Switch Users to Lightning Experience” item and click Select Users.

Kindly mark it as solved if it helps you.

Best Regards,
Nagendra.P