Do you want to customize your iPhone? You can do so by changing how its visuals appear, how you use gestures and sounds. Read on and learn how to tweak these settings and customize your iOS device as per your needs.
Visuals Tweaks:

Increase or Decrease the Text Size
First of all, you have to open the Settings app on your device.
Then you should go to the General.
You have to tap on the Accessibility.
Thereafter select the larger Text.
Later, you should select, hold & move the slider to enlarge the text size.
Now, switch the toggle of “Larger Accessibility Sizes” if you require text to be bigger.

Sources :- iPhone Visuals , Brother Printer Support
Convert Text Buttons into Real Buttons
Get started by going to the Settings app on your device.
Then you should go to the General option.
You have to tap on the Accessibility.
Now, you should switch the toggle of “Button Shapes” to the “On” position.
Decrease the White Point
To get started, launch the Settings app on your iOS device.
Then you should select the general option.
Navigate to the Accessibility.
You have to tap on Display Accommodations.
Now, switch the toggle of “Reduce White Point” to the “On” position.
Enable Parallax & Application Zooms
To begin with, go to the Settings on your device.
Then select the General option.
You have to tap on Accessibility.
Thereafter you should tap on Reduce Motion.
Now, switch the toggle of Reduce Motion to the “On” position.
Disable the Lower Case Keyboard
First, you have to open the Settings app on your device.
Then you should select the General option.
Go to the Accessibility.
Thereafter you have to tap on Keyboard.
Now, switch the toggle of “Show Lower Keys” to the “Off” position.
Turning on Character Preview
First & foremost open the Settings app on your device.
You have to select the General option.
Then go to the Keyboard.
Now, switch the toggle of “Character Preview” to the “On” position.
Touch-based Tweaks:
Enable Reachability
Open the Settings app on your device.
Select the General option.
Go to Accessibility.
Switch the toggle of “Reachability” to the “Off” position.
Stopping Manual Triggering Apple Pay
Go to the Settings app on your device.
Then you go to Wallet & Apple Pay.
Now, switch the toggle of “Double-Click Side Button” to the” Off” position.
Turning Off Shake to Undo
Unlock the Settings app on your device.
Go to the General option.
Select Accessibility.
Later, choose Shake to Undo.
Now, switch the toggle to disable it.
Disable the Split keyboard
Open Settings app on your device.
Select General.
Tap on Keyboards.
Now, switch the toggle to disable it.
Turning off Slide Over & Split View
Unlock the Settings app on your device.
Tap on General option.
Go to Multitasking and Dock.
Switch the toggle of “Allow Multiple Apps” to disable it.
Keep Picture in Picture from Activating Automatically
Navigate to the Settings on your device.
Select the General option.
Then tap on Multitasking.
Now, switch the toggle of the picture in Picture to enable it.
Disable Multitasking Gestures
Open Settings on your device.
Select the General.
Tap on Multitasking.
Now, switch the toggle of Gestures to disable it & limit the iPad to one &two finger expressions.
Delete Control Center from Applications
Open Settings on your device.
Then you should select Control Center.
Switch the toggle of Access Within Apps to disable it.
Turning off Control Center on the Lock Screen
Unlock the Settings app on your device.
Select Touch ID & Passcode.
Input the passcode.
Switch the toggle of Control Center beneath Allow Access When Locked.
Audio & Information Tweaks:
Preventing Lock Sounds & Keyboard Click
Open Settings on your device.
Go to Sounds & Haptics.
Move down & switch the toggles of Keyboards Clicks & Lock Sound.
Modify Maps Navigation Volume
Navigate to the Settings app on your device.
Tap on Maps.
Select Driving and Navigation.
Select option beneath Navigation Voice Volume: No Voice, Low Volume, Normal Volume, or loud Volume.
Stay Siri from Talking to You
Open Settings app on your device.
Tap on Siri & Search.
Now, switch the toggle of Listen for “Hey Siri.”
Disable Siri Suggestions
Swipe rightward on the screen to see View Today.
Then swipe upward to move down & select the Edit button.
Select the minus button near Siri App Suggestions.
Tap on Remove.
Stopping Calls from Going to Bluetooth Automatically
Unlock the Settings app on your device.
Go to General option.
Select Accessibility.
Move down & tap on call Audio Routing.
Now, tap on either Bluetooth Headset or Speaker.

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