"I would like the ones that are on this shelf."

Translation: Je voudrais celles qui sont sur cette étagère.

[karincanada]

Why is "ceux" not accepted?

[Sucy-en-Brie94]

Je voudrais ceux qui sont sur cette étagère. Accepted :)

[Jenny409129]

Why is this sentence 'que' and some others have been 'qui'?

[choracavaco]

"Qui" is always the subject: "ceux qui sont" ("qui" is the subject of "sont");

"Que" is always the direct object: "ceux que je vois" ("que" is the direct object of "je vois").

In this sentence it is correctly "qui", not "que".

[VikramPawa6]

Qui is followed by a verb,
Que is followed by noun

[titaloca2]

"j'aimerais ceux qui sont sur cet étagere" n'est pas acceptée.
On est fou?

[doublelingot]

Étagère is a feminine noun: cette étagère.

[AnneKierna]

Why is 'ceux' not accepted?