LockableBottomSheetBehavior can be used to lock a bottom sheet ignoring the swipe to dismiss actions done by the user.

LockableBottomSheetBehavior.kt

import android.content.Context
import com.google.android.material.bottomsheet.BottomSheetBehavior
import androidx.coordinatorlayout.widget.CoordinatorLayout
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View


class LockableBottomSheetBehavior<V : View>(context: Context, attrs: AttributeSet) : BottomSheetBehavior<V>(context, attrs) {

    private var mLocked = false

    fun setLocked(locked: Boolean) {
        mLocked = locked
    }

    override fun onInterceptTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        var handled = false
        if (!mLocked) {
            handled = super.onInterceptTouchEvent(parent, child, event)
        }
        return handled
    }

    override fun onTouchEvent(parent: CoordinatorLayout, child: V, event: MotionEvent): Boolean {
        var handled = false
        if (!mLocked) {
            handled = super.onTouchEvent(parent, child, event)
        }
        return handled
    }

    override fun onStartNestedScroll(coordinatorLayout: CoordinatorLayout, child: V, directTargetChild: View, target: View, nestedScrollAxes: Int): Boolean {
        var handled = false
        if (!mLocked) {
            handled = super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, nestedScrollAxes)
        }
        return handled
    }

    override fun onNestedPreScroll(coordinatorLayout: CoordinatorLayout, child: V, target: View, dx: Int, dy: Int, consumed: IntArray) {
        if (!mLocked) {
            super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed)
        }
    }

    override fun onStopNestedScroll(coordinatorLayout: CoordinatorLayout, child: V, target: View) {
        if (!mLocked) {
            super.onStopNestedScroll(coordinatorLayout, child, target)
        }
    }

    override fun onNestedPreFling(coordinatorLayout: CoordinatorLayout, child: V, target: View, velocityX: Float, velocityY: Float): Boolean {
        var handled = false
        if (!mLocked) {
            handled = super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY)
        }
        return handled

    }
}

USAGE

(LockableBottomSheetBehavior instance).setLocked(true / false)