Magento 2: Remove upsell products or move upsell products

1. If you want to remove the upsell products from product details page.
Open Your theme catalog_product_view.xml and add the following code.
File location:
app/design/frontend/Vendor/Theme/Magento_Catalog/layout/catalog_product_view.xml

<referenceBlock name="product.info.upsell" remove="true"/>

2. Add upsell product block under Tab section.

<referenceBlock name="product.info.details">
  	<block class="Magento\Catalog\Block\Product\ProductList\Upsell" template="Magento_Catalog::product/list/items.phtml" name="upsell.tab" as="upselltab" group="detailed_info" >
        <arguments>
         	<argument translate="true" name="title" xsi:type="string">Upsell</argument>
         	<argument name="type" xsi:type="string">upsell</argument>
        </arguments>
        <block class="Magento\Catalog\Block\Product\ProductList\Item\Container" name="upsell.product.addto" as="addto">
            <block class="Magento\Catalog\Block\Product\ProductList\Item\AddTo\Compare" name="upsell.product.addto.compare" as="compare" template="Magento_Catalog::product/list/addto/compare.phtml"/>
        </block>
  	</block>
</referenceBlock>