//Just add autoFocus = {false} on modal and autoFocus = {true} on input.
<Modal autoFocus={false}>
<Form>
<ModalHeader>Type Your Input</ModalHeader>
<ModalBody>
<Input autoFocus={true} />
<Button>Submit</Button>
</ModalBody>
</Form>
</Modal>
//Ref: https://simplernerd.com/js-reactstrap-modal-autofocus/c