at pleasure

Prepositional phrase

By arbitrary will or choice.

Japanese Meaning

恣意的に / 任意に / 自由意志により

The curator may rearrange the exhibits at pleasure, changing the layout whenever inspiration strikes.

学芸員は展示を自由に並べ替えることができ、ひらめき次第でレイアウトを変更します。

Sense（1）

By arbitrary will or choice.

I will at pleasure now revenge my wrong; And, Traytor, thou shalt feel my vengeance long