For changing the opacity of the element, do the following:

1. Select the element and expand the Effects https://cdn.elev.io/file/uploads/Nx6j1ilgYkjKwwUzxKv9Jx2yWyIGUZG4VbEE9W71H30/ptkf1aDb9ievo1eH7W_Kr3vm1BBCOobuDTtZVZT5AXc/fx-sRU.png tool from the right toolbar.

2. Click the Plus https://cdn.elev.io/file/uploads/Nx6j1ilgYkjKwwUzxKv9Jx2yWyIGUZG4VbEE9W71H30/99uxy_O1FjgfBaUXf70KyTDVjuJ8NDfWsSSuumaaIP0/plus-7oY.png icon and choose the Opacity effect from the left.

https://cdn.elev.io/file/uploads/Nx6j1ilgYkjKwwUzxKv9Jx2yWyIGUZG4VbEE9W71H30/kd1HeFqtRn-j2lv1kxUo4j8hbA7Em69tK1S8MmCtGtQ/Changing the opacity of the element.fw-ekA.png

3. Adjust the opacity level to get the look you want.

4. You can uncheck the Display checkbox to hide the effect.

https://cdn.elev.io/file/uploads/Nx6j1ilgYkjKwwUzxKv9Jx2yWyIGUZG4VbEE9W71H30/By-lbGHpoRCr4Tm1q3JbFgd5yny9OnHM2BgXzBNNenk/changing the opacity of the element2.fw-RXc.png

5. For removing the effect, click the Delete https://cdn.elev.io/file/uploads/Nx6j1ilgYkjKwwUzxKv9Jx2yWyIGUZG4VbEE9W71H30/ID0fAZPJOleotxqDy-OI_YCTQTaPp-aXzKFv6DUmpEs/delete-2-vKI.png button.

6. Save the page when you're done.