Android 7 inch tablet values folder

I have checked my layout an looks correctly, except 1 device landscape mode, which I would like to fix it.

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Supporting multiple screens looks outdated.

600dp: a 7” tablet (600x1024 mdpi).

720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).

mdpi Resources for medium-density (mdpi) screens (~160dpi). (This is the baseline density.)

hdpi Resources for high-density (hdpi) screens (~240dpi).

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My device is a 7" tablet with 800 x 1280 resolution: SM T235 has 216 dpi

I am wondering how could I fix his layout dimensions in landscape mode with less impact to others.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="@dimen/nav_header_height"
    android:background="@drawable/side_nav_bar"
    android:gravity="bottom"
    android:orientation="horizontal"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:theme="@style/ThemeOverlay.AppCompat.Dark">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/top_left" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:text="Tel: "
        android:textAppearance="@style/TextAppearance.AppCompat.Body1" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="123456789" />


</LinearLayout>

The imageView should be closer to left margin and the TextView with "Tel:" should be closer to image. But only in landscape mode and at this device. I have other device to test: 10" same resolution , and should not affect that.

I think the @dimen/activity_horizontal_margin needs to be changed in /res/values/dimens.xml by adding some suffixes to values folder. I have generated the values-v21 and values-w820dp

EDIT: The generated file at android Studio: res/values-w820dp/dimens.xml

<resources>
    <!-- Example customization of dimensions originally defined in res/values/dimens.xml
         (such as screen margins) for screens with more than 820dp of available width. This
         would include 7" and 10" devices in landscape (~960dp and ~1280dp respectively). -->
    <dimen name="activity_horizontal_margin">64dp</dimen>
</resources>

I have no idea why takes values from values-w820dp since my width is less than 820. I just needed to append the -land

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