Hello angiebaby77,
Thanks for posting in the Apple Support Communities.
We understand you're looking for assistance with the volume slider on the Lock Screen, as well as the Lock Screen view, right?
If we have that correctly, we'd like to see if the following information may help with the changes you're seeing. For starters, see if you can adjust the volume in Control Center while on the Lock Screen. While this may be different than what you're referring to previously, let us know if this helps out. You can view additional details on adjusting the volume here: Adjust the volume on iPhone - Apple Support
Adjust the volume in Control Center
When iPhone is locked or when you’re using an app, you can adjust the volume in Control Center.
Open Control Center, then drag
.
As for your Lock Screen, you can personalize this to your liking; however, some Lock Screens may not allow you to adjust some features. Take a look at the following resource for assistance with personalizing your Lock Screen to see if you're able to find one that's more appealing for you: Personalize your iPhone Lock Screen - Apple Support
If you'd like to provide feedback to Apple in regards to any changes you've noticed, feel free to do so here: Product Feedback - Apple
Have a great day!