This option is available on Matching Column (Step 2) of Update, Add & Export feed only. This field have extra setting. 
1. The value for the Requires Shipping (Physical Product) field will need to be mapped with a column that has the value of true/false.
For example, in your feed file have a column that requires shipping, then you can map with that field.
2. If you want to make all your products require shipping as true, then you can use the Update Product feed and select as static while inputting the static value as true. Please choose the static option.
3. If you want to make all your products require shipping as false, then you can use the Update Product feed and select as static while inputting the static value as false. Please choose the static option.
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